Look Inside. Feb 03, Minutes Buy. When Lucy Brennan, a Miami Beach personal-fitness trainer, disarms an apparently crazed gunman, the police and the breaking-news cameras are not far behind. Within hours, Lucy becomes a hero. The Sex Lives of Siamese Twins taps into two great obsessions of our time—how we look and where we live—and tells a story so subversive and dark it blacks out the Florida sun. When Lucy Brennan, a Miami Beach personal-fitness trainer, disarms an apparently crazed gunman chasing two frightened homeless men along a deserted causeway at night, the police and the breaking-news cameras are not far behind.